对流层上层低气压影响下的异常热带气旋路径

IF 2.8 3区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Han Li, Ziyu Yan, Melinda Peng, Xuyang Ge, Zhuo Wang
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引用次数: 0

摘要

热带气旋(tc)伴随着对流层上层冷低压(CL)会经历不寻常的路径。本研究设计了与观测情景相似的理想化模拟,以研究CL对TC轨道的影响。测试了TC运动对其相对于CL位置的灵敏度。结果表明,当初始位置在主干道以东时,主干道呈逆时针半圆轨迹;当初始位置在主干道以西时,主干道呈小的向南环形轨迹,随后突然向北转向。在西侧的TC经历相反的CL和β转向,而当TC在CL的东侧时,它们的方向相同。转向流分析表明,转向矢量在初期主要由CL诱导的上层流主导。CL的影响向下延伸,有助于形成对流层下层TC的不对称流型。当这两个系统接近时,TC发散流出侵蚀CL。当中心动脉和中心动脉靠近时,中心动脉循环发生变形并最终合并。由于CL的侵蚀,后期TC运动主要与β环流有关。还研究了TC运动对CL深度的敏感性。如果CL较浅,位于CL以西的tc会向西移动。与此相反,初始位置在CL东部的TC与CL的深度无关,其轨迹都是平滑的,CL的深度主要影响轨迹曲率和TC的平移速度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unusual Tropical cyclone Tracks under the Influence of Upper Tropospheric Cold Low
Abstract Tropical cyclones (TCs) accompanied by an upper tropospheric cold low (CL) can experience unusual tracks. Idealized simulations resembling observed scenarios are designed in this study to investigate the impacts of a CL on TC tracks. The sensitivity of the TC motion to its location relative to the CL is examined. The results show that a TC follows a counterclockwise semicircle track if initially located east of a CL while a TC experiences a small southward looping track, followed by a sudden northward turn if initially located west of a CL. A TC on the west side experiences opposing CL and β steering, while they act in the same direction when a TC is on the east side of CL. The steering flow analyses show that the steering vector is dominated by upper-level flow induced by the CL at early stage. The influence of CL extends downward and contributes to the lower-tropospheric asymmetric flow pattern of TC. As these two systems approach, the TC divergent outflow erodes the CL. The CL circulation is deformed and eventually merged with the TC when they are close. Since the erosion of CL, the TC motion is primarily related to β gyres at later stage. The sensitivity of TC motion to the CL depth is also examined. TCs located west of a CL experience a westward track if the CL is shallow. In contrast, TCs initially located east of a CL all take a smooth track irrespective of the CL depth, and the CL depth mainly influences the track curvature and the TC translation speed.
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来源期刊
Monthly Weather Review
Monthly Weather Review 地学-气象与大气科学
CiteScore
6.40
自引率
12.50%
发文量
186
审稿时长
3-6 weeks
期刊介绍: Monthly Weather Review (MWR) (ISSN: 0027-0644; eISSN: 1520-0493) publishes research relevant to the analysis and prediction of observed atmospheric circulations and physics, including technique development, data assimilation, model validation, and relevant case studies. This research includes numerical and data assimilation techniques that apply to the atmosphere and/or ocean environments. MWR also addresses phenomena having seasonal and subseasonal time scales.
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